<?php  // $Id: rest.php,v 1.8.6.2 2008/07/18 14:00:56 nicolasconnault Exp $
	   // Provide interface for topics AJAX course formats

require_once('../config.php');
require_once($CFG->dirroot.'/course/lib.php');
require_once($CFG->libdir .'/pagelib.php');
require_once($CFG->libdir .'/blocklib.php');


// Initialise ALL the incoming parameters here, up front.
$courseid   = required_param('courseId', PARAM_INT);
$class	  = required_param('class', PARAM_ALPHA);
$field	  = optional_param('field', '', PARAM_ALPHA);
$instanceid = optional_param('instanceId', 0, PARAM_INT);
$sectionid  = optional_param('sectionId', 0, PARAM_INT);
$beforeid   = optional_param('beforeId', 0, PARAM_INT);
$value	  = optional_param('value', 0, PARAM_INT);
$column	 = optional_param('column', 0, PARAM_ALPHA);
$id		 = optional_param('id', 0, PARAM_INT);
$summary	= optional_param('summary', '', PARAM_RAW);
$sequence   = optional_param('sequence', '', PARAM_SEQUENCE);
$visible	= optional_param('visible', 0, PARAM_INT);


// Authorise the user and verify some incoming data
if (!$course = get_record('course', 'id', $courseid)) {
	error_log('AJAX commands.php: Course does not exist');
	die;
}

$PAGE = page_create_object(PAGE_COURSE_VIEW, $course->id);
$pageblocks = blocks_setup($PAGE, BLOCKS_PINNED_BOTH);

if (!empty($instanceid)) {
	$blockinstance = blocks_find_instance($instanceid, $pageblocks);
	if (!$blockinstance || $blockinstance->pageid != $course->id
						|| $blockinstance->pagetype != 'course-view') {
		error_log('AJAX commands.php: Bad block ID '.$instanceid);
		die;
	}
}

$context = get_context_instance(CONTEXT_COURSE, $course->id);
require_login($course->id);
require_capability('moodle/course:update', $context);



// OK, now let's process the parameters and do stuff
switch($_SERVER['REQUEST_METHOD']) {
	case 'POST':

		switch ($class) {
			case 'block':

				switch ($field) {
					case 'visible':
						blocks_execute_action($PAGE, $pageblocks, 'toggle', $blockinstance);
						break;

					case 'position':  // Misleading case. Should probably call it 'move'.
						// We want to move the block around. This means changing
						// the column (position field) and/or block sort order
						// (weight field).
						blocks_move_block($PAGE, $blockinstance, $column, $value);
						break;
				}
				break;

			case 'section':

				if (!record_exists('course_sections','course',$course->id,'section',$id)) {
					error_log('AJAX commands.php: Bad Section ID '.$id);
					die;
				}

				switch ($field) {
					case 'visible':
						set_section_visible($course->id, $id, $value);
						break;

					case 'move':
						move_section_to($course, $id, $value);
						break;
				}
				rebuild_course_cache($course->id);
				break;

			case 'resource':
				if (!$mod = get_record('course_modules', 'id', $id, 'course', $course->id)) {
					error_log('AJAX commands.php: Bad course module ID '.$id);
					die;
				}
				switch ($field) {
					case 'visible':
						set_coursemodule_visible($mod->id, $value);
						break;

					case 'groupmode':
						set_coursemodule_groupmode($mod->id, $value);
						break;

					case 'indentleft':
						if ($mod->indent > 0) {
							$mod->indent--;
							update_record('course_modules', $mod);
						}
						break;

					case 'indentright':
						$mod->indent++;
						update_record('course_modules', $mod);
						break;

					case 'move':
						if (!$section = get_record('course_sections','course',$course->id,'section',$sectionid)) {
							error_log('AJAX commands.php: Bad section ID '.$sectionid);
							die;
						}

						if ($beforeid > 0){
							$beforemod = get_record('course_modules', 'id', $beforeid);
						} else {
							$beforemod = NULL;
						}

						if (debugging('',DEBUG_DEVELOPER)) {
							error_log(serialize($beforemod));
						}

						moveto_module($mod, $section, $beforemod);
						break;
				}
				rebuild_course_cache($course->id);
				break;

			case 'course':
				switch($field) {
					case 'marker':
						$newcourse = new object;
						$newcourse->id = $course->id;
						$newcourse->marker = $value;
						if (!update_record('course',$newcourse)) {
							error_log('AJAX commands.php: Failed to update course marker for course '.$newcourse->id);
							die;
						}
						break;
				}
				break;
		}
		break;

	case 'DELETE':
		switch ($class) {
			case 'block':
				blocks_execute_action($PAGE, $pageblocks, 'delete', $blockinstance);
				break;

			case 'resource':
				if (!$cm = get_record('course_modules', 'id', $id, 'course', $course->id)) {
					error_log('AJAX rest.php: Bad course module ID '.$id);
					die;
				}
				if (!$mod = get_record('modules', 'id', $cm->module)) {
					error_log('AJAX rest.php: Bad module ID '.$cm->module);
					die;
				}
				$mod->name = clean_param($mod->name, PARAM_SAFEDIR);  // For safety
				$modlib = "$CFG->dirroot/mod/$mod->name/lib.php";

				if (file_exists($modlib)) {
					include_once($modlib);
				} else {
					error_log("Ajax rest.php: This module is missing important code ($modlib)");
					die;
				}
				$deleteinstancefunction = $mod->name."_delete_instance";

				// Run the module's cleanup funtion.
				if (!$deleteinstancefunction($cm->instance)) {
					error_log("Ajax rest.php: Could not delete the $mod->name (instance)");
					die;
				}
				// Remove the course_modules entry.
				if (!delete_course_module($cm->id)) {
					error_log("Ajax rest.php: Could not delete the $mod->modulename (coursemodule)");
					die;
				}

				rebuild_course_cache($course->id);

				add_to_log($courseid, "course", "delete mod",
						   "view.php?id=$courseid",
						   "$mod->name $cm->instance", $cm->id);
				break;
		}
		break;
}

?>
